The Role of Orthography in Lexical Processing of the Phonological Variants in Second Language.

There is evidence that orthographic knowledge can influence on-line spoken-word recognition. Interestingly, when graphic and phonetic codes are not congruent due to the application of phonological alternation processes, people report hearing sounds that are matched to graphic (underlying), not phonetic codes (Hallé et al. in J Mem Lang 43:618-639, 2000). It is, however, not known whether the same effect arises in the processing of a non-native language (L2). In the present study, advanced Mandarin learners of Korean as well as native Korean listeners performed a phoneme monitoring task using words undergoing obstruent nasalization in Korean. The results showed that orthographic information dominated the phonetic judgments of the native Korean listeners, while the Mandarin learners' judgments relied more on the phonetic input. These results suggest that even the lexical access of highly experienced L2 learners differs from that of native speakers and that advanced learners still have difficulty employing orthographic information to access the L2 lexicon.

The proximate unit in Korean speech production: Phoneme or syllable?

We investigated the "proximate unit" in Korean, that is, the initial phonological unit selected in speech production by Korean speakers. Previous studies have shown mixed evidence indicating either a phoneme-sized or a syllable-sized unit. We conducted two experiments in which participants named pictures while ignoring superimposed non-words. In English, for this task, when the picture (e.g., dog) and distractor phonology (e.g., dark) initially overlap, typically the picture target is named faster. We used a range of conditions (in Korean) varying from onset overlap to syllabic overlap, and the results indicated an important role for the syllable, but not the phoneme. We suggest that the basic unit used in phonological encoding in Korean is different from Germanic languages such as English and Dutch and also from Japanese and possibly also Chinese. Models dealing with the architecture of language production can use these results when providing a framework suitable for all languages in the world, including Korean.

Lexical representation of Mandarin tones by non-tonal second-language learners.

The present study examined whether second language (L2) learners can lexically encode the tonal contrasts that do not occur in their native language. Advanced Korean learners of Mandarin performed a lexical decision task with medium-term repetition priming. The repeated words were either identical or interchanged with confusable tones. The results showed that advanced L2 learners behaved similarly to the native listeners in processing of L2 tones in favor of the correct lexical items, but still showed differences from native listeners, suggesting that L2 learners may have difficulty in utilizing the L2 sounds for word recognition.

Spoken-word production in Korean: A non-word masked priming and phonological Stroop task investigation.

Speech production studies have shown that phonological unit initially used to fill the metrical frame during phonological encoding is language specific, that is, a phoneme for English and Dutch, an atonal syllable for Mandarin Chinese, and a mora for Japanese. However, only a few studies chronometrically investigated speech production in Korean, and they obtained mixed results. Korean is particularly interesting as there might be both phonemic and syllabic influences during phonological encoding. The purpose of this study is to further examine the initial phonological preparation unit in Korean, employing a masked priming task (Experiment 1) and a phonological Stroop task (Experiment 2). The results showed that significant onset (and onset-plus, that is, consonant-vowel [CV]) effects were found in both experiments, but there was no compelling evidence for a prominent role for the syllable. When the prime words were presented in three different forms related to the targets, namely, without any change, with re-syllabified codas, and with nasalised codas, there were no significant differences in facilitation among the three forms. Alternatively, it is also possible that participants may not have had sufficient time to process the primes up to the point that re-syllabification or nasalisation could have been carried out. In addition, the results of a Stroop task demonstrated that the onset phoneme effect was not driven by any orthographic influence. These findings suggest that the onset segment and not the syllable is the initial (or proximate) phonological unit used in the segment-to-frame encoding process during speech planning in Korean.

The Role of Phonetic Similarity and Orthographic Information in Asymmetrical Lexical Encoding in Second Language.

This study examined two possible sources of asymmetrical lexical access: phonetic proximity to the nearest L1 category and orthographic information. Three groups of native Korean speakers learned Arabic non-words with sound pairs with/without an L1-dominant category (/l-r/ vs. /χ-h/), and then their phonetic categorization and lexical encoding abilities were evaluated. One group was presented with the same letters for the target pair (e.g., for both /l/ and /r/), the second group, different letters (e.g., for /l/, for /r/), and the third group, auditory input only. The results of discrimination did not show any effect of these two sources, whereas in lexical encoding, (1) a pair with an L1-dominant category was more accurately encoded; and (2) orthographic information hindered the lexical encoding. In the following spelling recall task, the scores from the learners with different letters for the target pair were similar to a ceiling. Thus, orthographic information might help them to have target-like representation, despite difficulties in online processing.

Examining the Temporal Development of Phonetic and Lexical Learning in Second Language.

The purpose of this study was to investigate how second-language (L2) learners lexically encode confusable phonemes. Given the inconsistency of previous studies on whether and if so how learners can establish separate lexical representations of confusable categories, we examined (1) how phonetic categorization and lexical encoding abilities were developed at the early stage of learning and (2) whether there are any differences in those abilities between the words with a sound pair from a corresponding native language (L1)-dominant category and those lacking such category. Native speakers of Korean learned Arabic words with these two types of sound pairs for four days and then their phonetic categorization and lexical processing abilities were evaluated in AXB discrimination and lexical decision tasks, respectively. The results showed that phonetic categorization of the words with a sound pair from an L1-dominant category developed very early. With success in their discrimination abilities, L2 learners began to overcome lexical competition from the words with such a sound pair. By contrast, learners showed poor sound discrimination and lexical encoding skills for words with a sound pair lacking an L1-dominant category. This suggests that (1) L2 learners' accurate phonetic categorization abilities are prerequisite to success in L2 lexical encoding and (2) lexical representations of the L2 words with confusable phonemes depend on the distinct types of sound category matchup between L1 and L2.

The Influence of Orthography on the Production of Alphabetic, Second-Language Allophones by Speakers of a Non-alphabetic Language.

This study investigated the influence of orthographic information on the production of allophones in a second language (L2). Two proficiency levels of native Mandarin speakers learned novel Korean words with potential variants of /h/ based on auditory stimuli, and then they were provided various types of spellings for the variants, including the letters for [[Formula: see text]] and ø. Subsequently, picture-naming and spelling recall tasks were given to the Mandarin-speaking learners. The results showed that Mandarin-speaking learners, after exposure to the spellings, began to produce and lexically store the /h/ variants following the given forms of the spellings of words, which provides support for the impact of spellings in the production and lexical storage of L2 allophones. However, the effect of L2-learning experience was not shown to be strong, which suggests difficulty in the native-like attainment of the production of L2 allophones.

Perception and production of English stops by tonal and non-tonal Korean dialect speakers.

This study examines whether relative weightings of voice onset time and onset F0 in Korean tonal vs non-tonal dialects affect the production and perception of English voiced and voiceless stops. Following Shultz et al. [(2012). J. Acoust. Soc. Am. 132, EL95-EL101], discriminant function analysis and logistic regression were conducted to calculate each speaker's relative weightings of these two cues in the production of target words and the labeling of the synthesized tokens according to these cues, respectively. The results demonstrated that the acquisition of second language (L2) contrasts is influenced by native language dialects, and production and perception are not developed in parallel in L2 acquisition.